/*
Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies)
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#ifndefUpdateAtlas_h
#defineUpdateAtlas_h
#include"ShareableSurface.h"
#ifUSE(UI_SIDE_COMPOSITING)
namespace WebCore {
class GraphicsContext;
class IntRect;
}
namespace WebKit {
class UpdateAtlas {
public:
UpdateAtlas(int dimension, ShareableBitmap::Flags);
PassRefPtr<ShareableSurface> surface() { return m_surface; }
inline WebCore::IntSize size() const { return m_surface->size(); }
// Returns a null pointer of there is no available buffer.
PassOwnPtr<WebCore::GraphicsContext> beginPaintingOnAvailableBuffer(const WebCore::IntSize&, WebCore::IntPoint& offset);
void didSwapBuffers();
ShareableBitmap::Flags flags() const { return m_flags; }
private:
void buildLayoutIfNeeded();
WebCore::IntPoint offsetForIndex(int) const;
int findAvailableIndex(const WebCore::IntSize&);
private:
enum State {
Available,
Taken
};
Vector<State> m_bufferStates;
Vector<int> m_layout;
ShareableBitmap::Flags m_flags;
RefPtr<ShareableSurface> m_surface;
};
}
#endif
#endif // UpdateAtlas_h